Improvement in processes of grinding journal boxes or bearings



l. W. SOLE. M s Prncesses of Grinding luurnai-Baxes er Bearings. No.139,772. Pate ed1une10, 1s73.

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AM PHOTU'UTHOGRAPHID ca My (OSBDRNES mamas) "UNITED STATES PATENTOFFICE.

- .-WENDELL OOLE, OF BROOKLYN, new YORK, ASSIGNOR To rnnirnnrrn COMPANY,OF STROUDSBURG, PENNSYLVANIA.

IMPROVEMENT IN PROCESSES 0F GRINDING JOURNAL BOXES 0R BEARINGS.

Specification forming part of Letters Patent No. 139,772, dated J une10, 1873 application filed December 7, 1872.

CASE A.

' ing, of which the following is a specification:

Prior to my invention it has been customary to dress theworking-surfaces of journal boxes or brasses for axles or shafting,either by boring them and afterward removing imperfections with thefile, or to grind them by solid emery-wheels of contracted diametercorresponding with the required bore of the brass or journal-box, andarranged to revolve with their axis coincident or in the same line withthat of the finished brass or bearing.

The first of these methods is unreliable as to truth as well as toevenness of surface, and is expensive, while by the grinding processabove mentioned there were objections which, among other purposes, it isthe object of my invention to remove. Thus the diameter of thegrinding-wheel, arranged in relation with the journ al-box, asdescribed, was steadily and rapidly changing so that it could not grinda circle of the same size for any great length of time, and such wheel,being necessarily limited in diameter, could never attain that speed atits periphery which is desirable to do rapid and effectual work, withoutrisking the heating of its bearings and causing other inconveniences.The cost, too, of such wheels for the amount of work capable of beingdone by them was very great, inasmuch as the larger portion of the wheelwas waste, it being useless so soon as the diameter was reduced thelength of said box, said wheel being of a transverse curvature on itsperiphery corresponding with the cross-section of the interior orworking surface of the box or brass, which is slid in transverserelation to the axis of the revolving wheel past or over its periphery,or, in case of the box being stationary, the wheel moved in likerelation to the box, or both simultaneously moved in direction of thelength of the box. By this process of grinding journal boxes or brasses,a grinding wheel of large diameter relatively to that of the box to beground may be used, and the necessary speed be attained at the peripheryof the wheel without risk of heating, and said process doing away withthe other objections hereinbefore named, the grinding curvature of thewheel being in transverse relation to the axis of the latter,

so that the diameter of the wheel is not restricted, and reduction ofdiameter by wear does not affect it, nor wear otherwise of the wheelimpair for a great length of time its adaptability and accuracy.

In the accompanying drawing, which forms part of this specification,Figure 1 represents an end view of a machine for grinding journal-boxesin accordance with my invention, such machine serving as well as anyother to illustrate my improved process. Fig. 2 is a side view of thesame. i i

Similar letters of reference indicate corresponding parts, but only theleading parts need here to be referred to. d a

A is a revolving emery or other grinding wheel of transverse curvature.on its periphery corresponding with the required curved crosssection ofthe interior or working surface of the journal-box. B is a journal boxor brass to be ground, arrangedjwith its axis in the plane or planes ofthe wheels rotation, that is, in transverse relation to the axis of thewheel, and made capable of motion throughout its length past or over theperiphery of the wheel in transverse relation to the axis of the latter,as by a sliding carriage, O, within which said box is held and madeadjustable, and which travels along ways on a table, D, that also may beadjustable to adapt the work to the wheel. 7

This machine I do not here claim, as the same is the subject of aseparate application for patent made by me, and machines of a brasses bygrinding them longitudinally in difierent description may be used tocarry my relation with their axis, substantially as specimproved processinto effect. itied. 7

What is here claimed, and desired to be se- J. W. COLE. cured by LettersPatent, is Witnesses:

The process, substantially as herein de- 'FRED. HAYNES,

scribed, of manufacturing journal boxes or MICHAEL RYAN.

